Hayward ECX360JN 5/16-Inch Nickel Plated Clamp Sleeve Nut Replacement for Hayward Perflex and Vertical Grid Filter Clamp sleeve nut replacement Fits Hayward Perflex extended cycle D.E filter model:EC50AC Also fits Hayward Perflex system models:EC50C80X5S, EC50C80X5STL, EC50C92S, EC50C92STL, EC50C93S and EC50C93STL Nickel plated finish Size 5/16-inch; weight 1-pound